Smelting method for improving surface quality of steel plate

A technology of surface quality and smelting method, applied in the field of iron and steel smelting, can solve the problems of little effect, poor effect, neglecting the effect of materials, etc., to reduce the damage of surface quality, facilitate high-temperature desulfurization, and reduce the probability of grinding treatment.

Inactive Publication Date: 2019-07-16
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Technologists who research on the surface quality of steel plates often focus on the rolling process and inspection process, but with little effect and poor res

Method used

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  • Smelting method for improving surface quality of steel plate
  • Smelting method for improving surface quality of steel plate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] This embodiment provides a smelting method for improving the surface quality of steel plates,

[0034] S1. Its chemical composition and mass percentage are as follows: C: 0.02%~0.20%, Si≤0.20%, Mn: 1.20%~2.20%, P≤0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070% , Cu≤0.50%, N≤0.0050%, Ti: 0.006%~0.020%, Cr≤0.30%, Al: 0.015%~0.050%, the balance is Fe and impurities;

[0035] S2. The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned, and the molten iron into the furnace S≤0.0020%, and the S after the converter is 0.0008%;

[0036] S3. Steelmaking adopts the process route of BOF→LF furnace refining→RH refining→continuous casting; converter tapping temperature is 1696℃; converter tapping uses pre-melted refining slag + active lime for slagging;

[0037] S4. After the molten steel reaches the LF furnace, the temperature is raised to melt the slag, and the composition meets the requirements of step ...

Example Embodiment

[0040] Example 2

[0041] This embodiment provides a smelting method for improving the surface quality of steel plates,

[0042] S1. Its chemical composition and mass percentage are as follows: C: 0.20%~0.60%, Si≤0.20%, Mn: 0.30%~1.60%, P≤0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070% , Cu≤0.50%, N≤0.0050%, Ti: 0.006%~0.020%, Cr≤0.30%, Al: 0.015%~0.050%, the balance is Fe and impurities;

[0043] S2. The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned, and the molten iron into the furnace S≤0.0020%, and the S after the converter is 0.0006%;

[0044] S3. Steelmaking adopts the process route of BOF→LF furnace refining→RH refining→continuous casting; converter tapping temperature is 1706℃; converter tapping uses pre-melted refining slag + active lime for slagging;

[0045] S4. After the molten steel reaches the LF furnace, the temperature is raised to melt the slag, and the composition meets the requirements of step ...

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PUM

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Abstract

The invention discloses a smelting method for improving surface quality of a steel plate, and the chemical composition comprises by mass percent: 0.02%-0.60% of C, less than or qual to 0.20% of Si, 0.30%-2.20% of Mn, less than or equal to 0.030% of P, less than or equal to 0.0050% of S, less than or equal to 0.30 % of N, less than or equal to 0.070% of Nb, less than or equal to 0.50% of Cu, less than or equal to 0.0050% of N, 0.006%-0.020% of Ti, less than or equal to 0.30% of Cr, 0.015%-0.050% of Al and balance of Fe and impurities. The smelting method provided by the invention can achieve the purpose of optimizing the surface quality of a casting blank by rationally adjusting the smelting composition, high-purity steel smelting, low-oxygen nitrogen harmful element control, reasonable superheat control, covering slag selection, dynamic soft reduction adjustment and the like.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a smelting method for improving the surface quality of steel plates. Background technique [0002] With the increasingly fierce competition in the domestic market, customers are increasingly demanding on the quality of steel plates. Industries such as construction machinery and shipbuilding have very strict requirements on the surface quality of steel plates. Among them, steel plates for Carter and steel plates for luxury cruise ships have extremely high requirements on the surface. The surface roughness visible to the naked eye caused by the exfoliation of the pressed iron oxide scale is not allowed to cause water ripples during the manufacturing process, and the entire steel plate is not allowed to have pits and pits. Technologists working on the surface quality of steel plates often focus on the rolling process and inspection process, but with little success an...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58B22D11/111B22D11/18C21C5/36C21C7/064C21C7/10
CPCB22D11/111B22D11/18C21C5/36C21C7/0645C21C7/10C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58
Inventor 翟冬雨吴俊平方磊姜金星洪君靳星刘呈军杜海军员强鹏殷杰冯巍雷晓荣
Owner NANJING IRON & STEEL CO LTD
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